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dibromide (EDB) Concentrations of TPH as gasoline, benzene, toluene, ethylbenzene and <br /> xylenes were detected in each soil samples from the tank excavation EDB was detected in <br /> one sample at a concentration of 2 9 parts per million (ppm) <br /> TPH, benzene, toluene, ethylbenzene and xylenes were detected in the water sample at <br /> concentrations of 150,000 parts per billion (ppb), 25,000 ppb, 43,000 ppb, 5,700 ppb and <br /> 32,000 ppb, respectively Lead was detected at a concentration of 0 67 ppm in the water <br /> sample, however, no EDB was detected <br /> 2.3 Groundwater Depth and Gradient <br /> Information obtained from monitoring wells located at 2420 Grant Line Road indicates that <br /> groundwater depth at the site is between 8 and 10 feet Groundwater flow direction at the <br /> Grant Line Site is northerly, consistent with flow direction in the Tracy area <br /> 3.0 SCOPE OF WORK <br /> The San Joaquin County Public Health Services - Environmental Health Division <br /> (PHS/EHD) is requiring an investigation of the lateral and vertical extent of hydrocarbon <br /> impacted soil and groundwater at the site <br /> Initially, we propose to drill and sample a total of four soil borings at the site Three <br /> • borings will be drilled in the area of the former UST excavation to a depth of approximately <br /> 10 feet A fourth boring will be drilled approximately 30 feet noith (down-gradient) of the <br /> excavation, this boring will be drilled to a depth of approximately 20 feet and completed as <br /> a groundwater monitoring well Soil samples will be collected at five-foot intervals <br /> However, one boring will be sampled continuously to obtain more precise lithologic <br /> knowledge of the site <br /> A groundwater sample will be collected via Hydropunch from two of the borings near the <br /> former UST excavation These samples will determine if additional wells will be required <br /> cross-gradient and up-gradient of the former UST excavation <br /> 4.0 PROCEDURES <br /> The following procedures will be pei formed to complete the scope of work, as described <br /> above <br /> 1) Prepare a Site Health and Safety Plan in accordance with the Occupational Safety <br /> and Health Guidance Manual for Hazardous Waste Site Activities - Prepared by <br /> National Institute for Occupational Safety and Health, Occupational Safety and <br /> 0-1-8na1 <br /> Ay&Serves,lie <br /> . SG95-OS ion w&-LaTIss,=T&.w 9s <br /> 2 <br />